Garrett Cooper wrote:
On Feb 7, 2007, at 1:51 PM, Steve Watt wrote:
In <[EMAIL PROTECTED]>,
<[EMAIL PROTECTED]> wrote:
Just wondering:
If I was to try and join a pthread that already exited, would there
be an error
message output and/or errno set to an error value, or would a system
hang?
Was the thread created with detach state set PTHREAD_CREATE_DETACHED or
PTHREAD_CREATE_JOINABLE? If it was PTHREAD_CREATE_JOINABLE, has the
thread already been joined?
You should be able to join a thread that was created joinable, only once.
If you join it again, or join a thread that was created detached, the
results are unspecified in POSIX. There is an error status that may
be returned, but it may do other bad things to your system.
Note that pthread_join doesn't set errno; it returns an error value
directly. I would never expect the system to hang, though the
application
might. If your application is hanging, make sure that you're not trying
to call pthread_join from within a signal handler.
It this variable on Unix OSes?
That the results are unspecified? No. What "unspecified" means?
Absolutely.
--Steve Watt KD6GGD PP-ASEL-IA ICBM: 121W 56' 57.5" / 37N
20' 15.3"
Internet: steve @ Watt.COM Whois: SW32-ARIN
Free time? There's no such thing. It just comes in varying prices...
I asked this because I was short on time and so was the person who
asked me earlier. I'm going to try giving the pthread exit and join a
shot just to see whether or not this is true or not and then I'll report
my results to the list.
Thanks for the insight though--hopefully my results will yield a
solid positive or negative to this being a problem.
-Garrett
Under Suse Linux there were absolutely no errors when I tried to do
this. I'll post a code snippet later.
-Garrett
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